feat: add retry attempt headers to every request - #156
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Lets a server tell a retry attempt apart from a request's initial attempt. - Request now carries an InvocationID generated once per logical call and kept across all of its retry attempts - AddRetryInfoHeaderHandler sets X-Sdk-Invocation-Id (stable across retries) and X-Sdk-Request: attempt=N; max=M (updated on every attempt) on Handlers.Sign, which re-runs on every retry - Registered by default for all services via defaults.Handlers() - Both headers are set before signing runs, so they end up covered by the request's signature (verified against vefaas.CreateSandboxRequest)
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Summary
Adds two headers to every outgoing request so a server can tell a retry attempt apart from a request's initial attempt:
X-Sdk-Invocation-Id: generated once per logical request, stays the same across all of its retry attemptsX-Sdk-Request:attempt=N; max=M, updated on every attemptThe handler is registered by default in
defaults.Handlers(), so it applies to every service built on this SDK without any per-service change.